Humidity deposit on the inside of the IG unit is a natural phenomenon and is absolutely normal. Please consult the SCHL document for a complete understanding of the situation. You will also find in this document the main sources of humidity in your house.
The colder it gets outside, the more the inside humidity (vapor) will go on your IG units. Increasing the inside temperature will only make the water go back to vapor, than go back once again to water as soon as you lower the temperature. Don't forget, it is not the windows that "creates" water: the water goes on the IG units surface because it is the coldest surface on the wall.
How do you reduce the symptoms? Consult the SCHL document to learn easy and fast ways to reduce the humidity level. In the same document, you will learn that you should not go over 50% during summer time, and gradually reduce to 25% at -30 degrees Celsius.
If your hygrometer indicates a normal level of relative humidity yet you still have problem, it might be necessary to calibrate your tool. Follow the SCHL easy instructions to calibrate it.
If you still have problem and you relative humidity seems to be controlled, do not hesitate to contact your general contractor for more information. You can also contact our after sales department for more information.